Texas Instruments MSP430x1xx manual 15. Destination Operand-Carry Left Shift, Rlc.B

Instruction Set

* RLC[.W]	Rotate left through carry
* RLC.B	Rotate left through carry
Syntax	RLC	dst	or	RLC.W	dst
	RLC.B	dst
Operation	C <− MSB <− MSB−1 .... LSB+1 <− LSB <− C
Emulation	ADDC	dst,dst
Description	The destination operand is shifted left one position as shown in Figure 3−15.
	The carry bit (C) is shifted into the LSB and the MSB is shifted into the carry
	bit (C).

Figure 3−15. Destination Operand—Carry Left Shift

Word 15 0

C
Byte	7	0

Status Bits	N:	Set if result is negative, reset if positive
	Z:	Set if result is zero, reset otherwise
	C:	Loaded from the MSB

V:Set if an arithmetic overflow occurs

the initial value is 04000h ≤ dst < 0C000h; reset otherwise

Set if an arithmetic overflow occurs:

the initial value is 040h ≤ dst < 0C0h; reset otherwise

Mode Bits	OSCOFF, CPUOFF, and GIE are not affected.
Example	R5 is shifted left one position.
	RLC	R5	; (R5 x 2) + C −> R5
Example	The input P1IN.1 information is shifted into the LSB of R5.
	BIT.B	#2,&P1IN	; Information −> Carry
	RLC	R5	; Carry=P0in.1 −> LSB of R5
Example	The MEM(LEO) content is shifted left one position.
	RLC.B	LEO	; Mem(LEO) x 2 + C −> Mem(LEO)

Note: RLC and RLC.B Substitution

The assembler does not recognize the instruction:

RLC @R5+.

It must be substituted by:

ADDC @R5+,−2(R5).

RISC 16−Bit CPU 3-59